It's just that I'd shortchange SO MANY songs to even attempt a list. I think if I had to make a "top 10 songs list" (don't even ask me to) it would probably have at least five or six 10-minute plus songs.

Between The Buried And Me-Swim To The Moon(17:54), Ants Of The Sky(13:10), White Walls(14:13), Disease,Injury,Madness (11:03),Fossil Generea:A Feed From Cloud Mountain(12:11)
Dream Theater- A Nightmare To Remember(16:10), The Shattered Fortress (12:49)
Mastodon- The Czar(10:54), The Last Baron(13:01),Hearts Alive(13:39)
The Mars Volta- Cygnus Vismund Cygnus(13:02) Cassandra Gemini (32:43),Day Of The Baphomets(11:57)
Ensiferum-Heathen Throne(11:09),Victory Song(10:38)

This is all i can come up with for right now but i know i have more but my Itunes is being stupid right now.